How do you cope with being love bombed?

I feel very foolish for this, but I wasn’t recently love bombed and fell right in to it. Three weeks later her told me he didn’t want a girlfriend. Now I feel insane bc I got so attached so quickly. Am I insane? I just hate being vulnerable and opened up all the way to him just for him to say he wants to take things slow and not being in a relationship. Am I insane for falling so fast so quick?
How do you cope with being love bombed?
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